The dress that Monica tries on in the expensive store and later models for Chandler has a halter neck with satin straps. However, the dress she grabs in Kleinman's and hangs in the living rooms has a sweetheart neck with lace straps.
Chandler's Barcalounger reappears even though Joey broke it episodes ago. Rachel sits in it while trying to talk Chandler out of booking the Swing Kings.
At the Gramercy Bistro, the shape of Kristen's wineglass changes between shots.
Monica books the "Swing Kings", but the band's drum says the band's name is "Jungle Swing".
When Ross says 'in fact', he is in the corner of the screen as the camera is facing Chandler and you can see that his mouth isn't moving in time with his speech.
Joey complains that he can't afford to take Kristen out for a fancy dinner. But he's employed on a popular soap opera - a regular character with a speaking part - he should have been able to easily outdo Ross on the financial front.