The car that almost runs over the Punisher has the license plate "ASM 129", which is a reference to the Marvel Comic Amazing Spider-Man, issue #129. This issue is the debut of the character the Punisher. Also, it is a Florida license plate most likely in reference to The Punisher (2004) which is set in Florida, and from which Thomas Jane reprises the role of the titular character.
A useful game exploit can be found on the 'Funeral Home' level. If the player stands near to the door in the attic section, it is possible to shoot enemies in the back as they enter. They will spawn endlessly allowing the player to accumulate vast scores thanks to the multiplier system which exponentially increases your points during a particularly long kill streak. It is not uncommon for someone to amass hundreds of thousands of points in a single sitting by exploiting this feature.