Monica is petting the cat which Phoebe thinks is her mother without getting any allergic reaction, although she told her former employer (at Mockolate) she was allergic to cat hair.
When Chandler is walking out of his room at the beginning of the episode and rips his jacket, the rip is lower on his arm than where the television unit supposedly ripped his jacket.
When everyone is looking at the lost cat poster, Joey mentions that they can split the reward 5 ways.