An accomplished Magician himself, it was probably harder for Dick Van Dyke to fail at the coin trick than it was for him to perform it.
When Amanda is giving the details about the will while they are at Bar-B-Que Bob's, there is a beer sign on the wall behind Amanda. It closely resembles the Miller High Life logo, but the name is spelled as "Midor". This is done deliberately, as advertisement signs in TV shows are often modified for legal reasons.