- Two bears were used. An 11 foot Grizzly Bear and a 7 foot black bear. They were secured behind a fence so actors and crew would not get injured. A man in a bear costume was used when the bear attacked.
- The project for grizzly was originally signed to Warner Bros.
- The idea for the film was from writer Harvey Flaxman when he was younger were he had an encounter with a grizzly bear on a camping trip. Flaxman thought of it and decided it would make a great idea for an animal attack film. David Sheldon and Flaxman began to write the script.
- Western actor Ben Johnson was first to be approached to play the role of Don.
- Clint Walker (I) was first asked to play Ranger Kelly but instead did the made for TV film Snowbeast (1977) and Christopher George (I) got the part of Kelly.
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