The Mummy (1999)
In The Mummy, some treasure-seeking explorers accidentally unearth a 3,000-year-old legacy of terror in the form of a mummy. When Rick and Evelyn are traveling through a tunnel in the City of the Dead, Rick is wearing a leather band on his wrist, but it disappears and reappears in every other shot.
Singin' in the Rain (1952)
Although Singin' in the Rain was set in the late 1920s, Kathy Selden (Debbie Reynolds) can be seen wearing a pink tulle dress. This type of fashion was clearly a product of the 1950s, but perhaps that was overlooked in favor of convincing the audience that Moses' toses were roses.