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Everything You Need to Know Before Attack on Titan Season 2

Wary of his own strength, Eren agrees under the condition that he be escorted by Mikasa and Armin, as well as members of the elite Scout Regiment, a group of expert soldiers with the skills and fortitude to explore the world outside the walls. Heading up this special task force is Captain Levi, an enigmatic and exceptionally skilled soldier who has little trust in Eren. [...] Thanks to an overwhelming effort from everyone involved, Eren manages to move a giant boulder to patch Wall Rose's massive hole, saving the remaining populace from further decimation by the Titans.[/quote
In the anime, the Scout Regiment shows up unexpectedly towards the end of the operation to seal the hole with the bolder, rather than being involved from the start as the quote implies.

Quote:

As Eren studies with the Scout Regiment, he learns about two Titans that Hange has captured to study, affectionately named Sawney and Beane. However, an unknown traitor murders Sawney and Beane to prevent further research, escaping into the land outside the walls.

In the anime, I'm fairly certain there was no indication that the culprit had escaped to outside the walls.

Does anyone know if those differences in summary vs anime are because of differences between the manga or anime?