Because the series follows Sam's journey, it's not surprising that most of the time all we see him leaping out of one scenario and into another. However, there have been a few occasions where we've seen more of what goes on with a leap, and I thought it would be fun to list them.
In Double Identity, when the Project attempts to leap Sam home, GFTW intervenes and leaps him into Don Gino. So this is the first instance where we see a host leap out and Sam replace him. It's also the first instance where we see a host leap back.
In the B**gieman, GFTW resets the leap, so Sam literally leaps back to the beginning of the leap with the full memory of what happened the first time. To Sam and the viewers, this just looks like spinning and passing out.
In Lee Harvey Oswald, Sam leaps into a photograph. Also, when he leaps around to different parts of Oswald's life, we don't see the usual blue and white spiderweb leap, but rather a second of flashing between the two scenarios with a blue background. When he leaps out of Oswald, it's a combination of this strange flashing effect with the usual spiderweb leap. And finally, when he leaps out of the Secret Service agent, the host returns in a photograph.
In Deliver Us From Evil we see Alia tortured during her leap out due to her failure to complete the mission. We also see the first instance of a red leap effect from the evil project.
In Dr Ruth we see Dr Ruth leap out of the Waiting Room and be replaced by the vampire.
In Return of the Evil Leaper we see Dawn leap out with the red leaping effect and be replaced by Alia. Later in the episode we see Alia almost leapt out by Lothos but a last-minute blue spiderweb shows us that she leaps with Sam.
In Revenge of the Evil Leaper we see Myers leap out with the red leaping effect and be replaced by Zoey. Alia leaps out with the blue effect and we see her replaced with her host. Finally Zoey is leapt out by Lothos after being shot and we see her replaced with Myers.
In Mirror Image, Stawpah leaps with the blue effect and simply disappears.
Have I missed any?
In Double Identity, when the Project attempts to leap Sam home, GFTW intervenes and leaps him into Don Gino. So this is the first instance where we see a host leap out and Sam replace him. It's also the first instance where we see a host leap back.
In the B**gieman, GFTW resets the leap, so Sam literally leaps back to the beginning of the leap with the full memory of what happened the first time. To Sam and the viewers, this just looks like spinning and passing out.
In Lee Harvey Oswald, Sam leaps into a photograph. Also, when he leaps around to different parts of Oswald's life, we don't see the usual blue and white spiderweb leap, but rather a second of flashing between the two scenarios with a blue background. When he leaps out of Oswald, it's a combination of this strange flashing effect with the usual spiderweb leap. And finally, when he leaps out of the Secret Service agent, the host returns in a photograph.
In Deliver Us From Evil we see Alia tortured during her leap out due to her failure to complete the mission. We also see the first instance of a red leap effect from the evil project.
In Dr Ruth we see Dr Ruth leap out of the Waiting Room and be replaced by the vampire.
In Return of the Evil Leaper we see Dawn leap out with the red leaping effect and be replaced by Alia. Later in the episode we see Alia almost leapt out by Lothos but a last-minute blue spiderweb shows us that she leaps with Sam.
In Revenge of the Evil Leaper we see Myers leap out with the red leaping effect and be replaced by Zoey. Alia leaps out with the blue effect and we see her replaced with her host. Finally Zoey is leapt out by Lothos after being shot and we see her replaced with Myers.
In Mirror Image, Stawpah leaps with the blue effect and simply disappears.
Have I missed any?