History YMMV / DefinitelyMaybe

** Will and [[spoiler: Sarah/Emily]] not being "in-sync" with each other was emphasized a lot during much of their relationship. [[spoiler: They became more "in-sync" with each other after their [[AmicablyDivorced divorce]].]]

* FriendlyFandoms: Despite comparisons between the two, the film is well regarded by the HIMYM fanbase.

* OohMeAccentsSlipping: Rachel Weisz, a little, particularly in the "I've Got A Crush On You" scene.

* FridgeHorror: April's collection of copies of ''Literature/JaneEyre'' with inscriptions in them. What if those books belong to people just like April? They might be searching everywhere for the book with their inscription in it because it means so much to them, but they'll never find it because April is hoarding them.
** Though maybe she plans on getting rid of them after she finds hers.

* HilariousInHindsight: The film's comparisons to ''Series/HowIMetYourMother'' only got more pronounced after ''HIMYM'''s GrandFinale, as the ending of the film is also remarkably similar to ''HIMYM'''s finale: [[spoiler:The protagonist's kid's mother and the woman the protagonist considers his true love are different women. The only difference is that there's no death involved]].

In the film:

* HilariousInHindsight: The ending of the film is remarkably similar to Series/HowIMetYourMother's GrandFinale. [[spoiler: The only difference is that there's no [[DeathOfTheHypotenuse death]] involved]].

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** [[spoiler: Emily/Sarah is responsible for Will meeting Summer/Natasha, while Summer/Natasha is the reason Will was reunited (and later married to) with Emily/Sarah. However, none of them lead to Will meeting April, yet she is the person Will talked to before his proposal to both of them.]]
** [[spoiler: When Will is telling the story, it was his daughter Maya who suddenly notices April, just like the way she (April) came in to his life unexpected.]]

* CounterpartComparison: The film is often compared to ''Series/HowIMetYourMother''.

* FriendlyFandoms: Despite the CounterpartComparison above, the film is well regarded by the HIMYM fanbase.

** Though maybe she plans on getting rid of them after she finds her.

* HilariousInHindsight: The ending of the film is remarkably similar to [[spoiler: HowIMetYourMother, except there's a divorce instead of a death]]

In the Soviet novel:

* LawfulNeutral: [[spoiler: Laws of Entropy. Their only concern is to prevent humanity (or any other civilisation) from becoming a supercivilisation in order to keep the universal balance, which they try to accomplish through relatively mild means at first.)]]

* HeyItsThatGuy: All the actresses basically

* FridgeHorror: April's collection of copies of ''JaneEyre'' with inscriptions in them. What if those books belong to people just like April? They might be searching everywhere for the book with their inscription in it because it means so much to them, but they'll never find it because April is hoarding them.

* {{Squick}}: some of Will's revelations struck some viewers as rather inappropriate things for a man to tell his ten-year old daughter.

* {{Squick}}: [[YourMileageMayVary For some]]; some of Will's revelations struck some viewers as rather inappropriate things for a man to tell his ten-year old daughter.

* CrowningMomentOfHeartwarming: Two, when Will finds her father's book for April (though he keeps it for years) and when Will reveals to Maya that he doesn't regret his failed marriage because she resulted from it.

* YourMileageMayVary: Each of the love interests has good and bad points, so it's up to the viewer to decide whether Will ends up with the right woman at the end.