https://screenrant.com/smallville-arrowverse-crisis-infinite-earths-tom-welling-cameo-criticism/

Tom Welling's cameo in the Arrowverse's Crisis on Infinite Earths is controversial, and a Smallville actor explains what's wrong with the scene.

Tom Welling Explains Why His Arrowverse Clark Kent Felt Different (Intentionally) To Smallville's (https://screenrant.com/tom-welling-clark-kent-arrowverse-smallville-differences/)

Tom Welling's Crisis on Infinite Earths cameo has become controversial over its changes, but the actor was the one who wanted Clark to be different.