There are other discrepancies (other than whether or not the stone was rolled away when the women arrived at the tomb). I should stress that some of these differences can scarcely be reconciled unless you do a lot of interpretive gymnastics when reading the texts. For example, what does one do with the fact that the women apparently meet different people at the tomb?
In Mark, they meet one man; in Luke, two men; and in Matthew, one angel. The way this discrepancy is sometimes reconciled, by readers who can’t accept that there could be a genuine discrepancy in the text, is by saying that the women actually met two angels at the tomb.
Matthew mentions only one of them but never denies there was a second one; moreover, the angels were in human guise, so Luke claims they were two men; Mark also mistakes the angels as men but mentions only one, not two, without denying there were two. And so the problem is easily solved!
But it is solved in a very curious way indeed, for this solution is saying, in effect, that what really happened is what is not narrated by any of these Gospels: for none of them mentions two angels!
This way of interpreting the texts does so by imagining a new text that is unlike any of the others, so as to reconcile the four to one another.