Sure, some things have changed but much as remained the same when it comes handicapping horses.
Here is a handicapping video from 1993, Playing To Win, with Bob Neumeier. Andy Beyer makes a cameo appearance as well (he plays himself making a $300 wager at Philly Park while in Vegas):
Trainer's Edge, also produced in the 90's, will definitely improve your game. The focus is on body language. For today's multi-track gambler, eliminating a horse who doesn't look so good in the post parade, or throwing in a horse that looks
good could be the difference when it comes to building a bankroll:
For a lot more nostalgia, check out "PartyManners" video channel "Horse Racing" on Youtube.