The One In Barbados, part 1 - S9-E23
Corrected entry: When they arrive in Barbados, Monica and Phoebe take a seat while Chandler and David check in. Rachel is there alone, yet she doesn't check in, she takes a seat with Monica and Phoebe.
The One In Barbados, part 1 - S9-E23
Corrected entry: When Phoebe is telling Monica that she does want to marry David, Monica is holding her drink in her left hand, the shot changes to Phoebe and Monica's drink is no longer in her hand. (00:11:30)
Correction: That just means Rachel didn't check in right away. Sometimes people hope the line will get shorter and do something other than wait in line during that time.