There are a lot of these at the end of UM segments that I've seen. At the very end of the segment, Stack says something along the lines of, "and there is one mysterious footnote to this case..."

One of those was Paul Whipkey, and RS mentions that his friend, Lt. Charlie Guess, had vanished in a plane only eleven days after him, and his remains were found a year later near where Paul's car was found, but the serial number of the plane that the remains were found with did not match the plane that Guess vanished in.

Another case was Angela Hammond, when RS says that Rob heard the kidnapper say after taking Angela, "I didn't need to use the phone anyway,"

And another one I can think of is the mentioning of Eugene Kvet's death at the end of the Kurt Sova case.

Can anyone think of any other examples like these?

The letter that Nyleen Kay Marshall's abductor wrote. Kind of makes you mad and sad at the same time

At the end of the Sharon Kinne segment, Stack says "a final intruiging footnote: among Sharon Kinne's belongings seized in Mexico was a .22 caliber target pistol that killed Patricia Jones...."

I always liked the footnote in the Clifford Sherwood case about how a driver's license had once been issued with Clifford's name and birth date in Edmonton. I never really believed at all that Clifford's father had abducted him and raised him in another province, but that last little detail made me wonder a little bit.

The footnote about the Yeshiva student being seen by the jogger on the morning of Chaim Weiss' murder is one of those random UM moments that I find kinda spooky for no real reason, though I'm not sure it has any significant to the case.

Oh, and the footnote where the mysterious military man shows up at Dan Casolaro's funeral and places a medal on his casket has to be my favourite "WTF" moment in UM history.

Not a "mysterious" footnote, but the inclusion of Dennis Depue's note to his ex-wife when read by Stack was all kinds of chilling.