In an area where there's a hub and grinder where you throw Redmond in and pull the chain while he gets ground in the gears you will come across a glitch.

If you start attacking the side of the grinder until Redmond goes into hyper mode, then stand in Redmonds place the hyper bar stays up at maximum and there will be an increase in your combo chain number.

By doing this you can easily get a 1000+ hit combo in about 3 or 4 minutes.