The One With The Tiny T-Shirt - S3-E19
Audio problem: When Joey chants "Oh Mommy, Oh Daddy, I am a big ol' baddie" his voice doesn't match his lip movements.
The One Where Monica Gets a Roommate - S1-E1
Trivia: Phoebe singing giant pigeon was a deleted scene from the pilot. When it was used years later in DVDs with extended footage the audio was not very good and they had to get Lisa Kudrow to redo the audio. (This information can be heard on extended DVD audio commentary for the pilot).
Answer: These are references to the TV show NYPD Blue. Deputy Andy Sipowicz is the name of one of the characters, whilst another character (Deputy Danny Sorenso) is played by Rick Schroder who previously starred in the show Silver Spoons.
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