Continuity mistake: When Ritchie yells "Aah. Aah. Aah." after the table lands on his toes, the shot zooms out. When Eddie hits him again, he is able to move away from the table. But we never see the table moving the final distance downwards towards the floor (implying he's pulled his feet out from under it), meaning his toes were never under the table at that point, only in the short scene beforehand.
Continuity mistake: After Eddie has performed checkmate on Richie, Richie punches Eddie who falls over. Eddie gets back up and lifts the table up. The chess board, ashtray, bottle of brown sauce and other things on the table disappear completely in the next shot showing the table land on Richie's feet.