In the beginning, when Sikowitz is telling them about the parade, Jade walks out of the room. A few shots later when Cat is biting her keys, Jade can be seen on the right side of the screen.
The police cuff Sikowitz to the back, but when Sikowitz escapes, he is cuffed to the front.
If you look closely at Robbie's left wrist when he tells André he had no way of telling time now because he broke his PearPad, he is wearing a watch.
When everyone is looking at the sack, Rex is on Robbie's lap. However, a few seconds later, he is sitting next to Robbie, even though Robbie never put him down.
In the classroom scene, you can see Jade bolting from the room; however, when the camera screens to Cat a couple of seconds later, you can see that Jade is still sitting behind her. After the episode first aired, the producers caught it and fixed it for subsequent airings.
Right before the tire runs out of air, Cat asks what street they're on and Rex says, "Yeah, what street?" However, Robbie wasn't even holding Rex so he couldn't have spoken.