Attachment
The Saintsblade is a reference to the Kingdom Hearts series, complete with sparkle and attack animations, closely resembling that of the Sleeping Lion Keyblade from Kingdom Hearts II.
Contributed by Tuli0hWut
Attachment
If you travel southeast of the Route 66 McQuarry Hidden History spot in Badlands South, you can stumble upon a golden one-eyed monolith. This monolith is the Zohar, an important artifact from the Xeno series. The design of the Zohar in this Easter egg appears to be a combination of its appearances in both Xenogears (green eye) and the Xenosaga trilogy (more cross-shaped design of the monolith).
Contributed by MehDeletingLater
According to series producer Jim Boone, the inspiration for the game was based on the films John Wick, Baby Driver, and Fast and Furious Presents: Hobbs and Shaw. Boone stated that the film John Wick gave inspiration for the brutal combat and melee battle sequences, while the film Baby Driver influenced the driving mechanics, and how stunts work in the game are based on the action scenes from Fast and Furious Presents: Hobbs and Shaw.
Contributed by Tuli0hWut