Other mistake: In the early scene where the submarine has surfaced, titanosaurus emerges from the water and seems to be standing on the ocean floor. Just a few minutes earlier, the sub was at a depth of 250 meters, ergo the dino has to be walking on water.
Other mistake: Clay Tanner plays Jack Henderson in this film, yet the end credits list him as "Delbert".
Other mistake: Peter Chang is billed in the opening credits as the one and only Fighting Instructors, plural.
Other mistake: When Clint Eastwood and George Kennedy are climbing the chimney rock during training, the climbing rope attached to Clint is well above him. He is the lead climber and the rock had not been climbed before, so the rope should be below him.