I haven't seen it in over twenty years. OJ was the bus driver, Arte Johnson was the tour guide, Lorenzo was the kidnapper.
Yea, Lorenzo looked very much at home as the villain, a natural. I think I watched it back then most for OJ, who I had seen Towering Inferno and Cassandra Crossing, but also to see Arte Johnson.
I was a little bored that Johnson was so serious.
And yes, it shifted plots. In reading other posts, I remember that was some plot that they were going to kidnap some rich girl, but then that priceless stamp business turned up out of the blue.
I was going, a stamp? If it came on as a late movie, I would probably record it to check it out again, but I wouldn't be nostalgic over it. Not yet anyway.
There are better movies from the seventies like this to check out.