Bob's twin brother Thomas "Tom the Zoologist" McGraw is the first character in Bob The Builder to live somewhere cold, the second character to live somewhere cold is Jana.
Tom never appears at the same time as his parents.
In the US version, Inspector Bernard Bentley says the moon's made of cheese.
This movie is named after an album by Amy Grant.
It's possible that the model of Thomas (Bob's twin brother) was used to make the model of Piper (Bob's nephew).