At the start of the Spacepants sketch, Bobby Moynihan says "You two boys are hard to track down", yet only Pete Davidson walks into frame and sits down. The conversation continues until Moynihan again refers to two people, then the table is bumped as Jon Rudnitsky sits down to join the conversation. Clearly he should have been there from the start.
When Leslie Jones exits the car in Naked and Afraid, she is supposed to be completely naked (with all the vital parts blurred out) but can clearly be seen adjusting her clothes.