When Becky looks through Booker's drawer, she finds a photo of him with his Jump Street co-workers celebrating his birthday. They are all dressed exactly as they will be seen two episodes later, in their first scene of High High (1989), including Tom's outrageous outfit. The photo was clearly taken during filming of the yet-to-air episode.
When Booker and Penhall are playing pool, the location of the cue ball moves in between shots.