Bloopers & Gaffes:

When the Matron takes off Mr Bigger's underpants, she does it sideways(!) - and they aren't even torn.

When the porter is going over to Sid James with the tea he has two cups in his hand. But when the camera shows the porter handing the tea to Sid James he has only one cup in his hand.

In the scene where Matron is trying to seduce Dr Tinkle (Kenneth Williams) on his bed, just before Sid and the other patients burst in, Kenneth tries to get up and clearly head-butts Hattie's nose. This doesn't look intentional, despite a comedy 'boink' sound effect being dubbed on.

This one can be quite difficult to spot. When Frankie Howerd is being stretchered away from his more than painful X-Ray appointment, he is seen to come through the double doors, before ending up on the floor courtesy of Jim Dale. The camera shows a close-up of an agonised Frankie Howerd. This shot doesn't last long, but in time that it is on, you can see the pink uniform of the Nurse who later picks up Mr. Bigger when he is floored in a few seconds time. However, when the shot changes to the wider view, showing the whole corridor, the Nurse appears after the trolley has been wheeled out of the double doors. Watch closely, and you'll see.

Behind the Scenes:

Sid James was recovering from a heart attack during the making of Carry On Doctor.  To ensure he could appear and not jeapordise his recovery, his character was confined to bed for much of the film.

Penelope Keith is listed in the cast of Carry On Doctor, but try and see if you can spot her in the film. It seems that her scene was cut prior to completion.