Carry On Regardless was the fifth in the series of Carry On films to be made being released in 1961. By now a fairly regular team was established with Sid James, Kenneth Connor, Charles Hawtrey, Joan Sims and Kenneth Williams all having appeared in previous entries. Hattie Jacques – who was also a regular – makes a cameo appearance during a hospital scene. "Professor" Stanley Unwin appears in a guest role, playing his trademark "gobbledegook" speaking act. This would be the final appearance in the series for early regular Terence Longdon. Liz Fraser makes her debut in Carry On Regardless and would appear in a further three Carry On films. This Carry On film was the only one to be filmed over 2 years, being filmed in both 1960 and 1961.