This episode is an immediate continuation of the one before it, but the large vase of pink flowers that had been to the right of the coffee house door is missing. It is seen during the "previously on Friends" recap.
During Chandler's conversation with Phoebe and Rachel in the coffee house about soul mates, the front of his hair changes during shots.
Ross's apartment was shown in many past episodes to be located on the end of the hallway. However, this is not the case in this episode.
At the 1:20 mark where Ross says "I gotta go" in the Central Perk scene, you can briefly see the cue card guy behind the counter.
Joey makes a comment about wanting to move to Vermont, to "leave the country". However, Joey read the entire "V" encyclopedia in season 4, with evidently amazing recall, and as such, he should know that Vermont is part of the United States.
By this point in the time line (based on Monica and Chandler's May 15 wedding date and the fact that Rachel knew she was pregnant at that time), Rachel would have been almost 11 months pregnant at this time.
The secondary storyline is that Phoebe is dating a guy who she thinks could be Monica's soul mate, and when Chandler discusses the possibility of soul mates with Monica, she states that she doesn't believe in soul mates. But at the end of Season 7 during their wedding Monica refers to Chandler as her soul mate in her wedding vows.