1. Calvin Johnson goes off. The Lions wide receiver has scored a touchdown in three straight games and has produced 100 receiving yards twice during that span. Big receivers have caused the Ravens trouble all season.
2. Penalties have impact on game. The Ravens committed a season-worst 12 penalties (including five pass-interference ones) at Green Bay on Monday. The last time the Ravens played Detroit was 2005, when they had 21 penalties (one shy of the NFL record).