"The Big Country," released in 1958, was primarily filmed in various locations in California. Key filming sites included the Sierra Nevada Mountains and the California desert, particularly around the town of Lone Pine and the Alabama Hills. The picturesque landscapes provided the perfect backdrop for the film's expansive western setting, showcasing the rugged beauty of the American West. The film's cinematography, directed by the renowned James Wong Howe, contributed significantly to its visual appeal.

In "The Big Country," Gregory Peck did not ride the bucking horse himself. The film features a scene with a challenging horse, and a stunt double performed that specific action. Although Peck underwent training for horse riding and performed many of his own riding scenes, the more dangerous bucking horse sequence was handled by a stunt performer to ensure safety and realism. The film showcases Peck's character's journey and moral dilemmas rather than focusing solely on the stunts.

Jean Simmons praised "The Big Country," highlighting its grand scale and the depth of its characters. She appreciated the film's exploration of themes like honor, pride, and the clash of cultures in the American West. Simmons noted that the film showcased her co-stars' performances and the stunning cinematography, which captured the vast landscapes beautifully. Overall, she considered it a significant work in her career and a classic Western that resonated with audiences for its storytelling and character development.

Gregory Peck and Charlton Heston had a professional relationship while working on "The Big Country" (1958). Despite their differing personalities—Peck being more reserved and Heston more outspoken—they respected each other as actors. However, it has been reported that their relationship was somewhat strained due to Heston's strong opinions and Peck's more laid-back demeanor. Overall, they maintained a level of professionalism on set, but their interactions were not particularly close.