The plane in the beginning sequence (N822Q) is a Beechcraft Model 65 Queen Air serial number LC-42. This plane is commonly referred to as the "Straight 65" because of its straight upswept tail.
The role of Eve Vayle was originally to be played by Stefanie Powers.
Barney takes Eve Vayle to a morgue to view her husband's body. It is the same morgue that was used in the episode TOD-5.