Sydney is playing a Dom at the sex club but she wears a collar, the mark of a sub.
When the convoy transferring Will Tippin is attacked and his bus tips over, you can see a pole being ejected from the underneath the bus. This pole (usually a portion of a wooden telephone pole) is fired from a "cannon" under the vehicle by the stunt team to cause the vehicle to flip over. More recently, teams have moved to pneumatic devices.