It's not quite as simple as the film: some (all) of the crew had flown in other aircraft at some point in the tour; the original co-pilot was given a command for his last 16 mission on another aircraft etc. Still, quite a notable event.
If you haven't read Bob Morgan's book about his time as the Belle's captain, it's worth a read.

(Although as Guy Gibson pointed out, the Dams raid was something like his 174th operational sortie!)