The drivers license for Paris (posing as George Miller) lists his address as 345 Hudson Drive. Later, when Tolan uses the radio to call in, he identifies the home as "365 Allendale, the home of George and Grace Miller".
In the closeup of the fake driver's license, the block for Marital Status says "No" even though the character is clearly married.
When Jim reports to Barney the frequency being used it is reported as 33.20 Kilocycles. This would be a much too low a frequency for any kind of voice communication. It should have been 33.20 Megacycles (or megahertz).
After Jim blows the locking mechanism on the outer gate, the remains seem to be made of wood, not metal.
Shortly after the thieves and the two IMF agents take over the Millers' house, there is a second insert shot of the tracking device inside the panel truck driven by Paris (Leonard Nimoy). The pointer on the device (a ballpoint pen marked "near" and "far) faces in the opposite direction from the earlier insert. All of the writing on the device, however, including the words "on" and "off" on its base, are also reversed in a mirror-image, indicating that the creators "flopped" the film to reverse right and left.
During the car chase after the holdup, a police car crashes through the display window of a store. As the window and displays fall away, the bare walls behind them are visible, revealing that the "store" is nothing but a false front on an empty shell.
A flipped shot of the pen homing device pointer in the van is used when Paris pulls up to the house.
Obvious stunt doubles when Jim and Barney are approaching and then climbing up the building at 47:05.
Dana's closing sarcastic comment only makes sense if she knew who was the leader of the bank robbers, information the rest of the IMF team knew but Dana did not.