Both Monica and Chandler had previously viewed and booked the Morgan Chase Museum as their wedding venue, but the actual wedding clearly takes place elsewhere.
Production for a movie wouldn't end early while filming and resume a few hours later. Therefore, Joey should have missed (or arrived late to) the rehearsal dinner rather than report to the studio late on a Friday night for a couple of hours.
When the Gellers are in Central Perk Judy expresses attraction towards Gunther as though she doesn't know him but Gunther was at Monica's 30th birthday, as was Jack and Judy.
During Ross's toast he made a joke about Chandler not being a fan of long term relationships, and the only one he had was with a girl named Molly, who was his dog. But Chandler hates dogs.
What sets off Chandler's pre-wedding cold feet is the fact that people are starting to refer to him and Monica as "the Bings". Monica had previously made it clear that she had no intention to give up her maiden name once married.
Everyone thinks it's hilarious that Ross thinks he could 'kick Chandler's ass'. However, in "The One with the Halloween Party," everyone agrees that Ross could take Chandler in any fight.