It's Not Easy Being Greene - S2-E13
Continuity mistake: Carter goes into the faculty dining room to talk to Peter and Dr. Vuselich - he has a brown strap around his neck (with his stethoscope) which changes position several times during the scene, even though he never touches it.
It's Not Easy Being Greene - S2-E13
Continuity mistake: Harper and Carter are in bed and his hand is bunched under the bedspread several inches from her hand. The next shot shows his hand is up by hers, touching her bottle of water, with no time for natural movement.
Answer: It was in "Chaos Theory", the first episode of season 9 (time code 00:13:55).
Super Grover ★