These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Dimitri went from the first boss of Sly 2 to be the first person to appear in the second teaser trailer for Thieves in Time.
Muggshot, the only villain (not pulling a Heel-Face Turn) to be brought back more than once thus far, appearing in two games and an animated short.
Foe Yay: Sly towards Carmelita, and HOW. Sly outright welcomes her chasing him and states his thefts wouldn't be as fun without her, and that's without getting into the Aww, Look! They Really Do Love Each Other. By the third game, it's pretty much canon.
Hate Sink: As of Thieves in Time, Penelope, what with betraying the people who saved her from Lefwee in the last game, several fans hate her now for being an ungrateful traitor, especially since she wants to kill Sly, the one who saved her from Tsao's dragon.
Though there are some fans who believe that Le Paradox tricked her into working for him.