From the ones I remember, the gags were somewhat subtle, and they didn't beat you over the head with the fact that it's April Fools Day. There was the one showcase with the booby prizes and everything going wrong before revealing two Camaros (1983). There was another from '99 with more booby prizes in the showcase (I believe the contestant was offered three toy cars, only for Bob to eventually reveal three real Geo Metros). I believe there's one from the early-80s where Bob is introduced, but the door opens to reveal an "April Fools!" sign, and he then enters from the audience. Just a few to remind the audience and the viewers what the day is.
Drew's version has used some funny gags (i.e. the turntable that wouldn't stop rotating, the car on blocks), but they run the joke into the ground by the time you reach the midway point of the show. I get that he loves the April Fools gags, dating all the way back to his sitcom, but sometimes less is more IMO. A gag here and there is cool...after awhile I'm thinking "I get it."