These are all the TSR-produced commercials I’ve been able to find so far. They aired in (from top to bottom) 1982, 1983, 1983, 1984, and 1985. I’ve posted them before with the exception of the 1984 spot, which is very well done and advertises not only the red cover Basic Set (Frank Mentzer revision), but the Marvel Super Heroes and Adventures of Indiana Jones RPGs. The 1983 Star Frontiers commercial is my favorite.
Let me know if I missed any.
2 Warps to Neptune 
Holy Crap! That is Alan Ruck in the first video! In the Green shirt! I KNEW Cameron from Ferris Bueller’s day off was into Dungeons and Dragons!