Inspiration for this puzzle came from my 30-year-old son Marc (whom Will bounced on his knee at my home about 27 years ago), who sells items on eBay for his London office-salvage business. One of his recent items was a plaque with the theme message, for which only the original WE'LL needed to be changed to WE WILL to break perfectly. By dumb luck, Will was short of non-rebus Thursdays, so it appears today only 19 days after he OK'd it.
I clue puzzles hard by having as many "new" clues as possible, requiring some thought and reasoning to solve, rather than ones that can be solved at sight by solvers with good memories. Most of the new factual clues here come from Internet research, such as 52A, 63A, 8D and 34D.
An added requirement to my harder clues is that only general knowledge should be required to understand them, even if the fact itself isn't well-known. For example, anyone from New York should know that AMAZIN (14A) is associated with the Mets, so it shouldn't be surprising that a website all about the Mets is called Amazin' Avenue.
One other clue nicety here that might not be obvious: a factual balance between new pop culture (like 18A, 55A), older (40A, 25D), and historical (42A, 10D). I made sure that all my factual references could be quickly and authoritatively verified with Google, and passed that info along to Will with the puzzle.
While some of my new clues for uncapitalized answers also come from Web research ("Time-stretching" for 41D SLO-MO came from a Wikipedia article), I can often think of something fresh by just letting my mind wander. That's where I got 56A and 1D, for instance.
Will is obviously on-board with all of this thinking, since he kept about 75% of my clues, including all the ones cited above.
In the 1,000+ crosswords I've constructed and the 5,000+ I've edited (for the New York newspaper Newsday and Puzzle Social) since adopting Crossword Compiler in 2000, I've found that with careful grid patterning it's never necessary to use obscurities, even for wide-open grids such as the 72-worder here. This sometimes requires that I check Google News and Google Books, to be sure that words I think are in common current use actually are. I look forward to the day where this fussiness will be standard procedure for constructors, so we can finally bid the OLEOs, OLIOs and ANILs of crosswordese an unfond farewell.
Anyone wishing to throw bouquets or stones at me, or a constructor wishing to learn more about my "crud-free" approach to puzzlemaking, is welcome to contact me through my website.