My favourite nit in Conan comes from the sequence where the trio climb the tower of Set.

First we see Subotai free-climbing up the stonework of the tower (possibly using some special climbing equipment, as happened on one of the origial stories). Then Conan and Valeria follow using a climbing rope.

I believe the sequence of events is supposed to be: Subotai climbs the tower and lets down a rope for Conan and Valeria.

Unfortunately, as Subotai climbs the tower, the rope is already (really obviously) hanging to his left.

My favorite nit in the first "Conan" is when they are sneaking into Thulsa's temple, when the Conan and company are painted in the black and white camo. They are supposed to be sneaking in, and as Valeria swings over the railing her feet smack into chains and send them swinging and clanging.

The movie that introduced Ah-nold to the wider audience.