The telephone that Albert J. Peterson (Jason Alexander) uses in Harry MacAfee's (George Wendt) home has a modern plug-in cord, which was not yet in use in the period in which this film is set.
Albert, Rose and Conrad are shown departing from New York's Pennsylvania Station, in the film a terminal with "head-end" outdoor platforms at the same level as the station lobby. In reality, trains ran through Penn Station with platforms on the lower level.