That actually goes back a long way. Remember how E.T. was lured by Reeses Pieces because the producers couldn't get M&Ms to pay for the product placement. That one did wonders for Reeses market share. Up to then, they had been insignificant.
The space station scene in 2001 with the AT&T, Pan-Am, etc. Blatent.
Or Fred and Barney sneaking out back during the Flintstones to catch a Winston Cigarette.
Other than the Fred and Barney example, all of those examples, while blatent, were plausible given the time. i.e., AT&T still existed (although with a crappy network

But all great examples. And I am glad Spielberg could not get M&Ms. Nothing in the world like Reeses pieces on a sundae.
