On some episodes, the front door to Hire for Higher opens the opposite way the front door normally opens.
The dock setup for Higher for Hire changes almost every episode to accommodate the direction from which the Seaduck is heading.
On some episodes, the navigator's seat in the Sea Duck has a Yoke in front of it and on some episodes it doesn't.
With the exception of Don Karnage who wears pirate boots, all of the characters in the show are barefoot. Yet throughout the series, there will always be socks, stockings, and shoes either discarded or hanging up on a clothes line or hanging out of a dresser drawer.