The girls wouldn't have been able to use the guys' plane tickets, since the tickets wouldn't have been in the girls' names.
In s10e8, Mindy says that her braces will be off in a couple of years. They're gone in this episode.
The story centers around the kids going on Spring Break. But when Peggy calls Al, she's in New Orleans at Mardi Gras. In 1996, Mardi Gras was on February 28. The timing of the episode is correct for Mardi Gras (air date February 18), but not for Spring Break, which would have been a month later at the earliest.