When Tom & Lisa are at the hot dog stand, Tom takes a bite right away, and immediately afterward, the hot dog is whole again.
As a result of budget minded stock footage use, near the end of the movie the Police Car changes from a 1946 Ford Coupe to a 1953 Nash Ambassador Sedan, then back to a 1946 Ford Coupe. Since the story is taking place in 1946, in this case the newer footage is at fault.
When Mrs. Weber approaches Rico while he's loading a box into his car, he leaves the door open. He then goes back into the bowling alley, locks up and returns to his car--the door is now closed and locked.
The doctor refers to the first soldier being "infected with venom". Venom is a toxin so the technical term would be "injected" or "poisoned" not "infected", which would refer to a microbial or viral agent.
Although the story is taking place in 1945-1946, all the women's clothes and hair styles are strictly 1955, when the film was actually made.
Even though we may accept Lisa's ability to change into cobra at will, there's also her unique ability to appropriately convert her wardrobe of the moment as well.
By the time the men get back to civilian life in New York City, it's now 1946 (license plate on the police car), but in the stock footage of the cab driving down Broadway, Wagonmaster is playing at the Globe, and Bright Leaf is playing at the Strand, both of them 1950 releases.
The plot takes place in 1945, and the GIs are wearing Army uniforms and insignia. However, they refer to themselves as Air Force, which wasn't created until 1947.
All six GIs in the beginning of the story are wearing Army rank markings on their sleeves, ranging from corporal to staff sergeant stripes. They speak of being in the Air Force. By this time (the time frame of the story - mid 50s) they would be referred to as 'airman' with totally different looking rank markings on their sleeves.