For To Slay a Dragon, I sourced a lot of maps but I can't just post them here because mostly they are not free. However, I can tell you what I've used thus far and where I found them:
Act 1
For the "On Safari" quest, I used "Forest of Fallen Giants" from Black Scrolls Games, which I purchased...
Thanos pre-dates Dungeons & Dragons itself by 2 years, and pre-dates Vecna’s debut by 3 years. Vecna was also pretty much just a couple of magic items until 1989-90, well after Thanos was an established arch-villain character for Marvel.
A family reunion for Maliboo in Toymaker Hall in Episode 9 of To Slay a Dragon, presented by Cast Party and EN Publishing. Available in the PodCast Party: A D&D Podcast feed, or right here: To Slay a Dragon Part 9: Lost Boy
Demogorgon was featured prominently in Out of the Abyss (2015) which was a full year before Stranger Things season 1.
The D&D product reacting to S1 of Stranger Things (2016), featuring a Stranger Things-style "Demogorgon" monster, was the Stranger Things Starter Set (2019).
Rather than talking about Vecna in “every” adventure, they have in fact mentioned him in zero adventures.
You could make a good case for Asmodeus being the overarching villain in 5E as he does get mentioned or make cameos in many of the adventures, but there has never been a direct...
The adventurers venture to the outlaw town of Last Chance. There they find an old friend, and a new ally. Episode 7 of PodCast Party: To Slay a Dragon, presented by Cast Party and @enpublishingrpg, now on YouTube:
My concern with the adventure is that it feels like it might be too much inside baseball. Like, targeted at a small subset of really insider-y, hardcore fans. Or like watching Avengers: Endgame as the first Marvel movie you ever saw.
For the vast majority of my players, who are casual and not...
I didn't interpret it to mean players can time-travel. I just think they mean that the DM can decide whether this adventure takes place before or after the events of Curse of Strahd. I don't think there is an implied opportunity to meet pre-Darklord Strahd.
I mean, Perkins said "it's the first adventure using the new rules."
They muddy the messaging and contradict themselves a lot. Apologists either ignore the mistakes or maintain that anyone who points them out is lying.
As written in Curse of Strahd, even if the players kill him, Strahd just returns a few months later courtesy of the Dark Powers, and the status quo is essentially re-set in Barovia. They definitely wrote it that way so that "canonically" Strahd is always there in Barovia.
It does feel like that, but, in fairness, at PAX East Perkins & Crawford did tout the Vecna book as "the first adventure featuring the new rules." I think folks are understandably confused. The messaging has been messy.