The archaeologist in the beginning of the episode say that the lost scroll is the proof that Xena married Ares, but the story featured in the scroll tells that in the end Xena didn't marry him.
Xena arrives to a tavern and tells Joxer that Gabrielle is alive, but we had already seen a scene where Xena told Joxer the same, next to the hole Gabrielle had fallen through, in season four episode "A Family Affair".
Ares says he's going to tell his parents, Zeus and Hera, about his upcoming wedding with Xena. However, by the time this scene was chronologically set (Season Four), Hera was trapped in Tartarus (which happened in a previous "Hercules" episode) and she didn't come back until the "Hercules" series finale, which took place during Season Five of "Xena".
Ares says the reason he supposedly saved Hope was because Gabrielle asked him. However, in season four episode "A Family Affair", which takes place chronologically after that scene, Gabrielle believes Hope is dead and she's horrified to discover she is still alive.
Xena asks Ares if Gabrielle is alive, but she already knows she is because she had seen her in one of the visions of her future in previous episode "Adventures in the Sin Trade II".
In one of the flashbacks scenes set in season 4 timeline Xena is wearing the new chakram that she gets in season 5.
Ares tells Xena that he saved Hope from the lava pit (from the episode "Sacrifice II"). However, in season four episode "A Family Affair", which takes place chronologically after this flashback scene, Xena doesn't know that Hope is alive. Furthermore, in "A Family Affair" Hope reveals that she was saved by Dahak, not by Ares.