When Wonder Woman saves Jimmy from the Centre's dinosaur, the image through Jimmy's lens shows her wearing shorts. In subsequent shots, she's back to wearing a skirt again.
When Jordan and Flagg made it into space, a pencil floated by Jordan's face to show they were in zero gravity. Pencils are never brought into a space vessel since the shavings would become a serious hazard should it ever have to be sharpened.
Rick Flagg's name is misspelled "Flag" in the closing credits.
A newspaper places the battle in 1960 but JFK, who took office in 1961, is depicted as the President of the United States.
When Hal and Ace are speeding on a highway just outside of Las Vegas, they pass a warning sign for the Nevada Test Site, stating that it is off limits by order of the United States Department of Energy. But the US Department of Energy (DOE) didn't exist in the 1950s; its predecessor then was the US Atomic Energy Commission. (It became the Energy Research and Development Administration in 1974; the ERDA was then incorporated into the new DOE in 1977.)