Greg's girlfriend says she has to break their date for Saturday night but when he calls a friend, Fred, he asks what he's doing Friday night. Several tines when Greg is preparing Peter for their big date, Greg mistakenly says that the date is for Friday night.
When Mike and Carol are sitting with Mike's Spanish business associate, and deciding what pizza parlor to take them to, the girls come in and refer them to Mariano's, "the best pizza place in town". They agree to go. In the next establishing shot, by the front awning, it is seen that they went to Nino's not Mariano's.