Our family rented 3 movies over the Thanksgiving holiday weekend at Hollywood video, each one of them had advertising on them the moment the DVD started the disc. On all three discs, the DVD players FFWD control was disabled, so we muted the TV and visited until the title disc title screen came up.
The advertisement issue at the beginning of the disc varies by studio. I know Disney and Universal are known for it. Paramount and Dreamworks usually don't.
I don't recall ever seeing ads or promo's on a Netflix rental. Okay... some have theatrical trailers as a special feature but they don't play automatically.