In a previous film in the series, the Mummy's Tomb, a reporter mentions being offered the chance to cover either the Mummy murders or "the Russian front" - a clear contemporary (WW II) reference. In the next film, the Mummy's Ghost, which supposedly takes place at least a few years later (based on Prof. Norman's reminiscences to his class), the Mummy is drowned in the swamp at the end. The action in this film, we are told by Cajun Joe in Tante Berthe's bar in the opening scene, is supposed to take place 25 years after the Mummy was drowned in the swamp. So the action of the film wouldn't be any earlier than 1970! Yet obviously the setting is supposed to be contemporary, i.e., about 1944. The time lines of the last three Mummy films clearly aren't co-ordinated.
When Ragheb is punched and drops the knife, the knife changes position when shown again.
Although this is typical of the era, it's still wrong: When Ananka rises out of the swamp, she goes into a pond to wash off the dried mud. Afterwards, her hair is perfectly coiffed and her face is completely made up: plucked and penciled eyebrows, eye shadow, eyeliner, mascaraed eyelashes and of course lipstick.
Obvious sped-up film when Princess Ananka rises from the swamp (see trivia).
At the end of the mummy's ghost when Kharis is carrying Amina and she is visibly starting to age , in the close up her feet are bare , but when she crawls out of the mud , she's wearing shoes .
When Kharis attacks Tante Berthe in her room, she gasps as he strangles her. The camera pans to the resurrected Ananka, who stands nearby. Tante Berthe's previous gasps are replayed as Ananka watches the struggle.
In the scene in the old abandon monastery, when we see Kharis in his sarcophagus for the first time; the servant of the Highpriest of Amon-Ra opens the sarcophagus and modern hinges, with modern screws, are visible.
The previous installment, The Mummy's Ghost (1944), ended with Kharis and Ananka sinking into a marshy swamp in Massachusetts. Approximately 25 years later, while draining a swampy Louisiana bayou, Kharis and Ananka are freed from their muddy tomb, allowing Kharis to resume his reign of terror among the bayou dwelling Cajuns. It is never explained how the swamp, containing the Mummies, was moved from Massachusetts to Louisiana over the passing years.
In the mummy's ghost , Amnia's hair starts to turn white , near the end when Kharis is carrying her towards the swamp it's completely white , but when she crawls out of the swamp in what is supposed to be many years later , her hair is back to it's natural color .