diff --git a/examples/components/ActivityIndicator/ActivityIndicatorExample.js b/examples/components/ActivityIndicator/ActivityIndicatorExample.js
index 66595b56..c19c12d7 100644
--- a/examples/components/ActivityIndicator/ActivityIndicatorExample.js
+++ b/examples/components/ActivityIndicator/ActivityIndicatorExample.js
@@ -129,7 +129,7 @@ const examples = [
     render() {
       return (
         <View style={[styles.horizontal, styles.centering]}>
-          <ActivityIndicator size="40" />
+          <ActivityIndicator size={40} />
           <ActivityIndicator
             style={{ marginLeft: 20, transform: [ {scale: 1.5} ] }}
             size="large"
diff --git a/examples/components/Touchable/TouchableExample.js b/examples/components/Touchable/TouchableExample.js
index 9c6b1a6c..03de4038 100644
--- a/examples/components/Touchable/TouchableExample.js
+++ b/examples/components/Touchable/TouchableExample.js
@@ -307,11 +307,11 @@ var TouchableDisabled = React.createClass({
   render: function() {
     return (
       <View>
-        <TouchableOpacity disabled={true} style={[styles.row, styles.block]}>
+        <TouchableOpacity disabled={true} style={[styles.row, styles.block]} onPress={action('TouchableOpacity')}>
           <Text style={styles.disabledButton}>Disabled TouchableOpacity</Text>
         </TouchableOpacity>
 
-        <TouchableOpacity disabled={false} style={[styles.row, styles.block]}>
+        <TouchableOpacity disabled={false} style={[styles.row, styles.block]} onPress={action('TouchableOpacity')}>
           <Text style={styles.button}>Enabled TouchableOpacity</Text>
         </TouchableOpacity>
 
@@ -321,7 +321,7 @@ var TouchableDisabled = React.createClass({
           animationVelocity={0}
           underlayColor="rgb(210, 230, 255)"
           style={[styles.row, styles.block]}
-          onPress={() => console.log('custom THW text - highlight')}>
+          onPress={action('TouchableHighlight')}>
           <Text style={styles.disabledButton}>
             Disabled TouchableHighlight
           </Text>
@@ -332,7 +332,7 @@ var TouchableDisabled = React.createClass({
           animationVelocity={0}
           underlayColor="rgb(210, 230, 255)"
           style={[styles.row, styles.block]}
-          onPress={() => console.log('custom THW text - highlight')}>
+          onPress={action('TouchableHighlight')}>
           <Text style={styles.button}>
             Enabled TouchableHighlight
           </Text>
diff --git a/src/apis/StyleSheet/__tests__/resolveTransform-test.js b/src/apis/StyleSheet/__tests__/resolveTransform-test.js
index a7143af6..642ddb71 100644
--- a/src/apis/StyleSheet/__tests__/resolveTransform-test.js
+++ b/src/apis/StyleSheet/__tests__/resolveTransform-test.js
@@ -15,7 +15,8 @@ describe('apis/StyleSheet/resolveTransform', () => {
     resolveTransform(resolvedStyle, style);
 
     expect(resolvedStyle).toEqual({
-      transform: 'scaleX(20) translateX(20px) rotate(20deg)' });
+      transform: 'scaleX(20) translateX(20px) rotate(20deg)'
+    });
   });
 
   test('transformMatrix', () => {
diff --git a/src/modules/NativeMethodsMixin/index.js b/src/modules/NativeMethodsMixin/index.js
index 3e2e248f..ba50f9bc 100644
--- a/src/modules/NativeMethodsMixin/index.js
+++ b/src/modules/NativeMethodsMixin/index.js
@@ -6,33 +6,9 @@
  * @flow
  */
 
-import { Component } from 'react';
 import findNodeHandle from '../findNodeHandle';
 import UIManager from '../../apis/UIManager';
 
-type MeasureInWindowOnSuccessCallback = (
-  x: number,
-  y: number,
-  width: number,
-  height: number,
-) => void
-
-type MeasureLayoutOnSuccessCallback = (
-  left: number,
-  top: number,
-  width: number,
-  height: number
-) => void
-
-type MeasureOnSuccessCallback = (
-  x: number,
-  y: number,
-  width: number,
-  height: number,
-  pageX: number,
-  pageY: number
-) => void
-
 const NativeMethodsMixin = {
   /**
    * Removes focus from an input or view. This is the opposite of `focus()`.
@@ -52,11 +28,8 @@ const NativeMethodsMixin = {
   /**
    * Determines the position and dimensions of the view
    */
-  measure(callback: MeasureOnSuccessCallback) {
-    UIManager.measure(
-      findNodeHandle(this),
-      mountSafeCallback(this, callback)
-    );
+  measure(callback) {
+    UIManager.measure(findNodeHandle(this), callback);
   },
 
   /**
@@ -74,50 +47,23 @@ const NativeMethodsMixin = {
    * Note that these measurements are not available until after the rendering
    * has been completed in native.
    */
-  measureInWindow(callback: MeasureInWindowOnSuccessCallback) {
-    UIManager.measureInWindow(
-      findNodeHandle(this),
-      mountSafeCallback(this, callback)
-    );
+  measureInWindow(callback) {
+    UIManager.measureInWindow(findNodeHandle(this), callback);
   },
 
   /**
    * Measures the view relative to another view (usually an ancestor)
    */
-  measureLayout(
-    relativeToNativeNode: Object,
-    onSuccess: MeasureLayoutOnSuccessCallback,
-    onFail: () => void /* currently unused */
-  ) {
-    UIManager.measureLayout(
-      findNodeHandle(this),
-      relativeToNativeNode,
-      mountSafeCallback(this, onFail),
-      mountSafeCallback(this, onSuccess)
-    );
+  measureLayout(relativeToNativeNode, onSuccess, onFail) {
+    UIManager.measureLayout(findNodeHandle(this), relativeToNativeNode, onFail, onSuccess);
   },
 
   /**
    * This function sends props straight to the underlying DOM node.
    */
   setNativeProps(nativeProps: Object) {
-    UIManager.updateView(
-      findNodeHandle(this),
-      nativeProps,
-      this
-    );
+    UIManager.updateView(findNodeHandle(this), nativeProps, this);
   }
 };
 
-/**
- * In the future, we should cleanup callbacks by cancelling them instead of
- * using this.
- */
-const mountSafeCallback = (context: Component, callback: ?Function) => (...args) => {
-  if (!callback) {
-    return undefined;
-  }
-  return callback.apply(context, args);
-};
-
 module.exports = NativeMethodsMixin;
diff --git a/src/modules/ReactNativePropRegistry/index.js b/src/modules/ReactNativePropRegistry/index.js
index e13d00a9..38bb5514 100644
--- a/src/modules/ReactNativePropRegistry/index.js
+++ b/src/modules/ReactNativePropRegistry/index.js
@@ -14,15 +14,19 @@
 
 const emptyObject = {};
 const objects = {};
+const prefix = 'r';
 let uniqueID = 1;
 
+const createKey = (id) => `${prefix}${id}`;
+
 class ReactNativePropRegistry {
   static register(object: Object): number {
     let id = ++uniqueID;
     if (process.env.NODE_ENV !== 'production') {
       Object.freeze(object);
     }
-    objects[`${id}`] = object;
+    const key = createKey(id);
+    objects[key] = object;
     return id;
   }
 
@@ -32,8 +36,8 @@ class ReactNativePropRegistry {
       // we want it to be a no-op when the value is false or null
       return emptyObject;
     }
-
-    const object = objects[`${id}`];
+    const key = createKey(id);
+    const object = objects[key];
     if (!object) {
       console.warn('Invalid style with id `' + id + '`. Skipping ...');
       return emptyObject;