1. Marvel logo at the beginning of The Avengers and Iron Man 3 is the same logo that appears on The Amazing Spider-Man 1 & 2
- The Avengers & Iron Man 3
- The Amazing Spider-Man 1 & 2
2. Sony and Marvel Agreed to put Oscorp Tower in The Avengers but ran out of time. And it was also rumored that Stark Tower would've appeared in The Amazing Spider-Man as well.
3. The Oscorp logo from The Amazing Spider-Man appears in Iron Man 3 Video Game.
4. The Amazing Spider-Man film has a Marvel artwork book, All MCU films have received them, and no other non MCU films have received them.
5. The Amazing Spider-Man films have had huge toy lines (Fox hasn't had one since 2009's X-Men Origins: Wolverine).
6. Kevin Feige (President of Marvel Studios) produced The Amazing Spider-Man in 2012. He hadn't produced any Marvel based film outside of the MCU since 2007.
7. Spider-Man is on Marvel's 75th Anniversary Logo. The X-Men and Fantastic Four are nowhere to be seen.
8. Sony cancelled Spider-Man 4 in 2010 to later announce a reboot for 2012 and lost around a billion dollars because of it. They would've made more money making Spider-Man 4.
9. Sony and Marvel made merchandising deal in 2011 that allowed Marvel and Sony to benefit more off of Spider-Man films.
10. In 2013 while talking about The Amazing Spider-Man 2, a Sony executive said "We're working very closely with Disney/Marvel".
11. Iron Man and Spider-Man appeared in a Target commercial together in 2012 (the first and only time 2 different studio owned Marvel properties appeared together in any form).
12. Spider-Man is Marvel's most popular solo character, they would do anything to have him back.
13. The Amazing Spider-Man films and MCU films don't really contradict each other. All the studios would have to do is come up with a timeline so we know when each event happens, and then create a Marvel One-Shot that has something that explains why we haven't heard about Spidey in the MCU yet.
14. Sony has been having money issues the past few years, and the Spider-Man films domestic total has been dropping ever since 2002. The latest film is currently at $194 Million domestically. If you include him in the MCU I guarantee it will go up to $400 Million at least, and the foreign total would go up to at least $600 Million making Spider-Man a billion dollar property.
15. All Spider-Man films have been Marvel Entertainment productions.
The Fantastic Four, Daredevil, Elektra, Hulk (2003), Punisher, Wolverine, and X-Men films credits read "In association with Marvel Entertainment". For example the X-Men films read as "Twentieth Century Fox Presents in association with Marvel Entertainment A Donner's Company Production"
While Every Spider-Man film reads as "Columbia Pictures Presents A Marvel Entertainment/Laura Ziskin Production". For the other films the Marvel name is on there but Marvel wasn't really involved, but on the Spider-Man films they are indeed Marvel Entertainment (which is now owned by Disney) Productions.