The theme is superb. I love it! LOVE it. ADORBS.
ESCAPEARTIST and DISAPPEARINGACT are just warmups for the real fun that occurs in the bottom portion of the grid. Here, we have HARRYHOUDINI hiding literally from the crosses, which are clued as if the letters of his name weren't part of the answer. I almost left that theme answer blank, thinking that was the trick.
But no! Each crossing answer has become a new word with the addition of the letters in his name. I first truly realized something was up when I wanted to put "Tempe" in at 36D: Home of Arizona State University (TEMPE[R]). Slowly it dawned on me that I could actually put Houdini's name in, and the puzzle would still work. Beautiful stuff!
I love "acing" becoming AC[H]ING, "Oman" becoming O[H]MAN, and RSA becoming [U]RSA. What a fun and clever theme.
By the way, it turns out that Neil Patrick Harris, in addition to being a very funny actor and an outstanding Broadway singer, is an accomplished magician, so that must be the connection here.
To be honest, the rest of the fill is not quite so amazing, although it is smooth enough, and not boring enough to become a YAWNER or MEH (C- for that one). I enjoyed the boldness of HEGOAT (16A: Billy). SEXTAPE is its own kind of bold, of course.
EDWINA is a reference to an old favorite film. PECAN pie is one of my favorites. But of course my favorite answer has to be 8D: 2013 World Series champs (REDSOX). That's too easy.
Least favorite gets to be APOP (4D: Individually).
I did have an error, by putting PINTo in. That's stupid. It's a ship. It has to be female (PINTA).