The Pharaoh's in a Rut (2) - S1-E28
Continuity mistake: When the fight starts and after Batman gets into the sword fight with Tut's henchman, Tut's women start to leave. But in the close-up when Batman states he stayed sane by reciting the multiplication tables backwards, the women leave again.
The Pharaoh's in a Rut (2) - S1-E28
Visible crew/equipment: After Tut's henchmen carry "Bruce" from the mansion, Robin tells Alfred to meet him in the Batcave, and as Alfred walks toward the foyer a crew member is visible past the doorway, at the left. (00:11:30)
The Pharaoh's in a Rut (2) - S1-E28
Revealing mistake: When Bruce Wayne is strapped to the stretcher hurtling toward the cliff, after he breaks through the "300 Ft. Drop" sign, we cut to a different angle where the wire pulling the stretcher is visible. (00:02:40)
Answer: There wasn't one singular city used. It was shot in and around various locations in California, plus on a lot of sets and backlots. Ex. Some scenes were shot in LA, some in Pasadena, some in Santa Barbara, etc.
TedStixon