Deliberate mistake: When Penny is loaded onto the ambulance at the end, her gurney is rolled straight in. This is wrong, the paramedics will collapse the wheels and slide the gurney into locks to hold it still during the drive. It was done this way since Mittens and Rhino were hiding in the collapsible section.
Add timeGrumpy Scot
Deliberate mistake: When the song comes on showing the three travelling across the U.S. on the map, it has them in the bed of the dumptruck, on top of a dirt pile going across 3 states. A dumptruck wouldn't be travelling that far with a load of dirt that can be gotten in any state.