The first shot of the Brisby home after the move shows no one outside. A couple of shots later, Mrs. Brisby and the children are outside. When Jeremy appears on the following shot, there is no one outside again.
The very first long-shot of the rats working the rigging to lift the Brisby home shows the block already hanging from block-and-tackle in the background, yet the very next scene cut shows the block being lifted from the mud. Also the block is never shown to be entirely covered in mud at any time during the movie , but it is during the lift.
As Jeremy arrives with the string at the end of the movie, Teresa is bandaging Mrs. Brisby's right hand. After Jeremy meets the female crow and returns to ask for the "sparkly," Mrs. Brisby's left hand is already fully bandaged, but the right hand is still not done. A couple of shots later, both hands are fully bandaged.