Trapper Keeper: Part 1 - S3-E11
Continuity mistake: When the students are queueing up outside the nurse's office, in the first shot of the hallway, a Ra Yellow student can be seen just outside the doorway, and behind him, an Obelisk Blue student can be seen. In the next shot, the Obelisk Blue student has been replaced with a Slifer Red student. (00:02:31)