Yes and no. Yes on the tube dents/bends. I had two tasco scopes do this when I cranked the rings down too tight. Their tubes must be thinner than bushnells and others or something. I can crank the weaver rings on down on other scopes brands as tight as I possibly can and no scope damage, but tascos you can't.
On the recticles turning, mine didn't turn, and I don't see how putting a bend in the tube would cause the crossairs to turn, given how the scope is made. The bend would reduce or eliminate the ability to adjust the scope, possible wedging the crossairs against the top of the tube, but it wouldn't turn it.
One good thing about weaver rings, you can really tighten them down so a scope won't slip. One bad thing about weaver rings, you can really tighten them down so tight that you can dent the tube if your not very careful.
I don't use weavers and tascos anymore. I usually use millet, although I'd use warne, leopold, etc. I use weaver rings on all my non tasco scope, nothing holds them tighter!
later,
scruffy
