Image: Shooting was stalled in the film thanks to some problems with a mechanical co-star. The warring on set is almost as famous as the film itself, and added to the production's woes - it was had gone way over budget and filming took three times longer than scheduled. "So then it's interesting as to whether my father was doing it partly to get a better performance out of Richard." "My father was an established actor, had seen it all and was also a distinguished writer - I think that him and Richard just didn't get on, but Richard does say that on occasion, in private, that they did. "We all know what it's like to be in confined spaces, you know? And with different personalities, there can be quite a clash, and there certainly was between Richard Dreyfuss and Robert Shaw. "These three actors, with very distinctive personalities and at different stages in their careers, were kind of stuck together. "It's kind of gone into legend really, because the difficulties they had with the mechanical shark were extensive," Ian Shaw told Sky News - the show's co-writer who also stars as his father, Robert. It's also where play The Shark Is Broken begins. Pics: Universal/Kobal/Shutterstock & Helen Maybanks Image: Like father like son - Robert Shaw is being played by his son, Ian.