Sphinx

Sphinx (1981) was budgeted at $11 million with an expected 13-week shooting schedule, including five weeks of filming in Egypt at Cairo and Luxor. More than $1 million was spent on the interior sets built at the Mafilm Studios. It took six months to create these "vast sets," including a replica of King Tutankhamun's tomb and the undiscovered tomb of Seti I, with approximately 900 recreated artifacts. A negative, containing approximately 30 minutes of footage featuring a boat sequence in Luxor, disappeared in transit to Cairo, Egypt. But due to "international tensions," the incident was kept quiet.

The heroine takes a taxi from the Nile Hilton hotel to the Cairo Museum--those two buildings are more or less next door to each other (e.g. online guides for tourists say it is a five-minute walk). Taking a taxi instead of walking is not a goof. Maybe she was tired.