SummerSlam 1991 is remembered for the on-screen wedding of Randy Savage and Miss Elizabeth, dubbed "A Match Made in Heaven" by announcer Gene Okerlund. Savage and Elizabeth had been married in real life since December 1984. WWF personalities shown at the reception afterward included Bobby Heenan, Gene Okerlund, J.J. Dillon, The Undertaker, and Jake Roberts. The last two were uninvited guests. Roberts proceeded to frighten Elizabeth with his snake while Undertaker attacked Savage with an urn.
This was contrasted with "A Match Made in Hell", the main event of the show, which was a handicap tag team match between WWF Champion Hulk Hogan and The Ultimate Warrior against Sgt. Slaughter, General Adnan and Colonel Mustafa. It was Slaughter's final on-screen appearance as an Iraqi sympathizer, a storyline fueled by the Gulf War.
Among the other on-screen highlights of the event was The Legion of Doom defeating The Nasty Boys to win the WWF Tag Team Championship. The team became the only tag team in wrestling history to have held the WWF Tag Team Championship, the NWA World Tag Team Championship, and the AWA World Tag Team Championship. Another highlight was Bret Hart winning his first singles championship in the WWF when he defeated Mr. Perfect for the WWF Intercontinental Championship. After winning the match, Hart climbed into the stands to hug his mom and dad Stu and Helen Hart.
- Dark Match - Koko B. Ware defeated Kato
- The British Bulldog, Ricky Steamboat and The Texas Tornado defeated The Warlord and Power and Glory (Paul Roma and Hercules) (with Slick)
- Bret Hart defeated Mr. Perfect (c) (with The Coach) to win the WWE Intercontinental Championship
- The Natural Disasters (Earthquake and Typhoon) (with Jimmy Hart) defeated The Bushwhackers (Bushwhacker Butch and Bushwhacker Luke) (with Andre the Giant)
- Virgil defeated Ted DiBiase (c) (with Sensational Sherri) to win the WWF Million Dollar Championship
- Big Boss Man defeated The Mountie (with Jimmy Hart) - "Jailhouse Match", where the loser had to spend 24 hours in a New York City jail
- The Legion of Doom (Hawk and Animal) defeated The Nasty Boys (Brian Knobs and Jerry Sags) (c) (with Jimmy Hart) in a Street Fight to win the WWE Tag Team Championship
- Irwin R. Schyster defeated Greg Valentine
- Hulk Hogan and The Ultimate Warrior defeated Sgt. Slaughter, Col. Mustafa and General Adnan - Handicap match with Sid Justice as the special guest referee