Smallville cast and crew prior and post connections/reference to DC.

Just started rewatching Justice League Animated Series (2001), Flash sounded kinda familiar and when I searched internet, I was suprised to find it's Michael Rosenbaum (Smallville Lex).

Few trivia I know or top of my head:

Annette O'Toole (Martha Kent) played Lana in Superman III (1983).

Amy Addams, which was post Smallville.

Chloe reference in Supergirl (2015).

Please share yours.

Edit: Please kindly keep the responses limited to the cast and crew of Smallville to other DC shows, films and comics if any.