Kings Gambit Accepted can be dangerous!
Love playing the King's Gambit, especially accepted. What a mess here though. 4.h3 is interesting. What was the time control? Must have been lightening fast for Black to play so badly. Hard to believe it was a serious game between good players. Brutal blows with the Knights working together is pretty slick though.
I'm just thinking about 4.h3. Not sure it's a good idea as g3 could become a good square for the knight with h6 and Kf6-h5-g3. In my experience, white generally has to contest the move g5 with 4.a4. 4.a3 looks like it does nothing about the black pawn on f4 and loses a tempo. I'm a big fan of the kings gambit with white, but if I can't break up the black pawn mass early on I start sweating.
I'm know expert in the KG but google 'Exeter Chess Club Variations of the Kings Gambit'. h4 looks like the Kieseritsky Variation (3...g5).
Just some thoughts.