I saw Time Tunnel at a screening at the 24th World Science Fiction Convention (Tricon) in Cleveland, Ohio, on Labour Day weekend in 1966.
The episode was the one broadcast the following week, "Rendezvous with Yesterday", about the meeting of the Titanic and a large lump of ice.
The comparison with the Star Trek pilot (shown the day before) was devastatingly hilarious. The protagonists tried to convince the captain of his peril by showing him a copy of a newspaper with the headline Titanic Sinks (I carry a copy of this in my back pocket for just such an emergency) but for some reason was not believed. The hero kept on looking at his very advanced watch that showed how close in time the collision was getting. I called out, "Show him your watch!" but was hissed by some close to me.
Piece of crap. (IMHO)