Carry on Behind is certainly one of the best in the series, the last truly worthy addition to the Carry on canon before the dire days of England and Emmannuelle. Script is consistently funny, and cast are top-notch, with many of the regulars (Kenneth Williams, Kenneth Connor, Bernard Bresslaw, Joan Sims, Jack Douglas, Peter Butterworth, Patsy Rowlands) and a few new faces (Windsor Davies, Elke Sommer). Great fun, and a real "ensemble" feel.
Of the DVD extras, the commentary has its moments, but there are too many people. Perhaps what would have worked better would be to have two commentaries, one with Dave Freeman (scriptwriter) being interviewed and one with the rest of the cast in conversation (Rowlands, Douglas, Larry Dann). It tended to get a bit confusing, and not all the comments are audible without fiddling around with the volume. Plus there are a few too many digressions -- I was more interested in hearing about the film itself, than about how nice Les Dawson and Benny Hill were or how much Rowlands enjoyed working with Tony Richardson on Tom Jones! Having said that, it was still an enjoyable and entertaining commentary.
Nicest extra is the stills gallery, comprising a slide show of some charming, rarely seen behind-the-scenes shots, with written commentary and Eric Rogers' music.