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To understand the film, none.

To understand the jokes, you need to watch or know X-Men Origins: Wolverine and X-Men: Days of Future Past.

Those jokes and all the other references (almost) are listed in this Movies & TV answer. (It’s full of spoilers.)

Colossus's character did appear in X2, X-Men: The Last Stand and X-Men: Days of Future Past, but none of his past roles have any importance for this film and he is even played by different actor actors.

_{Note: There are many non X-men film jokes/references too like Green Lantern, Taken (film series) etc etc which you can check from above Movies and TV answer.}

To understand the film, none.

To understand the jokes, you need to watch or know X-Men Origins: Wolverine and X-Men: Days of Future Past.

Those jokes and all the other references (almost) are listed in this Movies & TV answer. (It’s full of spoilers.)

Colossus's character did appear in X2, X-Men: The Last Stand and X-Men: Days of Future Past, but none of his past roles have any importance for this film and he is even played by different actor actors.

_{Note: There are many non X-men film jokes/references too like Green Lantern, Taken (film series) etc etc which you can check from above Movies and TV answer.}

To understand the film, none.

To understand the jokes, you need to watch or know X-Men Origins: Wolverine and X-Men: Days of Future Past.

Those jokes and all the other references (almost) are listed in this Movies & TV answer. (It’s full of spoilers.)

Colossus's character did appear in X2, X-Men: The Last Stand and X-Men: Days of Future Past, but none of his past roles have any importance for this film and he is even played by different actor actors.

To understand the film, none.

To understand the jokes, you need to watch or know X-Men Origins: Wolverine and X-Men: Days of Future Past.

Those jokes and all the other references (almost) are listed in this Movies & TV answer. (It’s full of spoilers.)

Colossus's character did appear in X2, X-Men: The Last Stand and X-Men: Days of Future Past, but none of his past roles have any importance for this film and he is even played by different actor actors.

_{Note: There are many non X-men film jokes/references too like Green Lantern, Taken (film series) etc etc which you can check from above Movies and TV answer.}

To understand the film, none.

To understand the jokes, you need to watch or know X-Men Origins: Wolverine and X-Men: Days of Future Past.

Those jokes with all other references (almost) present over this movies & TV answer. (Its full of spoilers)

Colossus's character did appeared in X2, X-Men: The Last Stand, X-Men: Days of Future Past but none of his past role have any importance for this film and he is even played by different actor actors.

To understand the film, none.

To understand the jokes, you need to watch or know X-Men Origins: Wolverine and X-Men: Days of Future Past.

Those jokes and all the other references (almost) are listed in this Movies & TV answer. (It’s full of spoilers.)

Colossus's character did appear in X2, X-Men: The Last Stand and X-Men: Days of Future Past, but none of his past roles have any importance for this film and he is even played by different actor actors.