Did Arrow Just Hint At a Flashpoint Connection?

Spoilers ahead for tonight's episode of Arrow, titled "Legacy."

Tonight's episode of Arrow may have provided a little bit of insight into one of the big, as-yet-unresolved mysteries surrounding the show's fifth season: what does John Diggle have to do with the Flashpoint timeline?

Producers have claimed that while "Flashpoint" will remain largely contained to The Flash, some other characters -- they specifically name-dropped Diggle -- will be impacted by the alterations to the timeline created when Barry Allen traveled to the past to save his mother from being murdered by the Reverse-Flash.

Diggle says he has "the worst case of deja vu ever," which would be easy enough to ignore except for the fact that we've already been told that he's the one character outside of The Flash who will be impacted significantly by the events of The Flash's season three premiere, "Flashpoint."

Nobody has really said how Diggle will be affected, and there are various fan theories -- our personal favorite is that the events of Flashpoint might somehow remove Diggle's wife and daughter from continuity, opening him up to new romances and putting his life in greater danger since it's always assumed that most writers won't kill somebody who's got a young family waiting at home.

Whatever it is, it seems entirely possible we might have got the first inkling that it's happening tonight. While Diggle didn't appear in most of the episode, he did briefly have a conversation with Oliver right at the end -- and that's where he said something that could very well be an innocuous line of dialogue, but seems more likely to be a clue.

Diggle says he has "the worst case of deja vu ever," which would be easy enough to ignore except for the fact that we've already been told that he's the one character outside of The Flash who will be impacted significantly by the events of The Flash's season three premiere, "Flashpoint," which aired last night.

There's no other indication that Diggle has been affected by anything, and no mention of anything that might give us an idea about what he's up to, exactly (besides being in a military setting and apparently overseas) or what Flashpoint might have done to him.

What do you think? Was this a clue, or are we making way too much of a throwaway line of dialogue? Chime in below!

Supergirl airs on Mondays at 8 p.m.; The Flash on Tuesdays at the same time, Arrow on Wednesdays, and DC's Legends of Tomorrow on Thursdays. The Flash will debut its new episodes on The CW starting October 4; Arrow, October 5; Supergirl, October 10; and DC's Legends of Tomorrow October 13.