Chrome - For the new spell check feature in chrome, the notification is full of incorrect spellings.
Tumblr for Android - pressing the “create” button for a long time lets you easily choose one of the two most frequent kind of posts (photo or text)
YouTube - The favicon changes based on whether the video is buffering, playing, or paused.
Youtube - Page load progress bar in Chrome changes to Youtube red.
Gmail- Shows quick link to track packages when there is a tracking number in the email.
Gmail - When receiving an email from PayPal, there is a small key in Gmail to show that it is from an authorized sender.
Google Music: When disliking a track, it automatically jumps to the next track.
Chrome - When downloading a file that “appears malicious” Chrome asks if you want to keep or discard it.
/via Tee Jay Green