In The Relaxation Integration (2017), Amy voiced her desire to have her wedding "on a cliff overlooking the ocean at sunset"; Sheldon agreed but then implied that he hates outdoor weddings and would throw himself off the cliff. In this episode, Sheldon has indeed shot down the idea of a cliff on a beach for being "too outsidey".
Title reference: a chaotic chain of events and memories is revealed when the boys are searching for their old Bitcoins.
Aired on Kaley Couco's 32nd birthday
Sheldon telling Amy to get a dish so he can serve her some cold revenge is a reference to the Klingon proverb "Revenge is a dish best served cold" from Star Trek II: The Wrath of Khan (1982). The same proverb was also referred to by Sheldon in The Creepy Candy Coating Corollary (2009), when plotting his revenge against Wil Wheaton. In both cases, his set-up backfires significantly.