Dan,
the Hilarious Bowline is substantially a reversed slipped Tugboat A!
Edit:
or, better, a slipped Harness Loop (Artilleryman’s Knot, ABoK #1050) (the reversed Tugboat A and the Harness Loop have the same structure).
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The back-flipped collar is on the right in the picture (remember in my version the legs of the bight were crossed)… I should attach a better picture…
The instructions were clear! 
Thank you Mark!
please, notice that you repeat the same phrases at p. 12 and p. 13.
Ciao,
s.