Thinking Joey will be a no-show at the wedding because he is so late, Rachel goes to find another minister and finds a Greek Orthodox wedding going on the bride and grooms last names are Anastassakis and Papasifakis. Anastasakis was Jennifer Aniston's father, John Aniston's last name before he legally changed it to Aniston.
After they are pronounced husband and wife, the song being played by the string quartet is "Everlong" by the Foo Fighters. Foo Fighters are Courtney Cox' favorite band.
The string quartet plays two songs. When Chandler (with his parents) and Phoebe/Rachel (with Ross) walk down, the string quartet plays "Groovy Kind of Love". When Monica (with her parents) walks down they play "My Love", originally by Paul McCartney and Wings.
When Chandler is hiding out in his office at work, the name on his office door is MIKE SMITH.
Final occurrence of Ross's "giving the finger without actually giving it", done by Joey when the director walks away after advising Joey he must stay as long as his co-star is alert.