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Credits are based on the cutting continuity deposited in the film's copyright record. Opening and closing credits differ in order. In both opening and closing credits, only Jack Warden's character name is given. Other character names were found in Filmfacts. Actor Christopher Malcolm's name was misspelled Malcom in the closing credits, but was spelled correctly in the opening credits.
Filmfacts, Hollywood Reporter production charts and news items reported that the Columbia film was shot in and around Copenhagen, Denmark and that interiors were shot at ASA Studios in Copenhagen.
Welcome to the Club marked producer Walter Shenson's directoral debut. It also marked the first feature film made by Brian Foley, who portrayed "Lt. Andrew Oxblood," although the 1971 Von Richhofen and Brown, which was shot after Welcome to the Club, was released first. African-American singer-actress Marsha Hunt (1946-) made her motion picture debut in Welcome to the Club. Some sources list her as Marsha A. Hunt, possibly to distinguish her from the more prominent actress Marsha Hunt (1917-), who was onscreen from the mid-1930s.