Big Trouble in Little Sanchez - S2-E7
Continuity mistake: Morty is digging through a locker that is among a set of six other locker doors, the one Morty is digging through is the one furthest to the left. Immediately after Tiny Rick shows up, Morty is suddenly standing behind the third locker from the left. But also, Tiny Rick originally appeared on the right side of Morty and has suddenly switched to Morty's left side in the following shot. (00:04:10)