Okay, in this episode, Sam asks Al, "Remember
when we simo-leaped together?" (Al answers no to the
question, but that's not my point).

Anyway, compare that to the dialogue between
Al and Dr. Aleese at the end of "The Leap
Back" :

Dr. Aleese : "Does he remember me?"
Al : "No. He doesn't even remember us simo-leaping
together."

But his mind being swissed cheese each time he leaps may cause him to remember things at time that he forgot earlier.

This is true. The first time Sam leaped he couldn't remember his own name. Most other eps, he does. And sometimes he'll come out with something he doesn't realize he knew (like saying an inkblot looks like the "subatomic structure of a quark": "Shock Theatre"). Also, Sam remembers the simo-leap in "Harvey Lee Oswald," so at some point some of this memory came back.

Whoa. This was a very intense episode. A tough acting job for Scott Bakula, and he pulls it off spetacularly. The Emmy Nomination was deserved.

Also, a small note: the teaser at the end of the previous episode showed Sam leaping in, then stepping forward in the hall and falling onto the bloodstained carpet. Some of this looks like it got cut in the actual teaser to the ep, where we join the scene just as or after Sam has fallen. The difference was enough to surprise me, especially since they make a big deal out of the fact that Sam had already leaped when he got blood on his clothes (therefore Jack Stone, his host, can't be the killer).

I loved this episode. It reminds me of Red Dragon by Thomas Harris