Science Fair - S1-E1
Continuity mistake: When Scott is trying to tell Cassie that it just takes a minute, before he jets off to the bathroom to shrink down, there is a guy standing behind him in a black shirt and shiny black hair looking at a pink sign. He then shrugs and the camera pulls back just before he takes off, and the guy in the black shirt has vanished. Also, the sign that had pink on it is now all white, and a green hot air balloon appears on the ceiling. (00:00:15)