Numerous numerous things to pay special attention to in manufactured homes. Many inspectors mistakenly charge far less than typical home inspections for these. In my experience, the older the unit, the longer the report is going to be. BE very careful and take your time with this one. Don't be scared but do be meticulous and thorough.
These are different beasts and will have unique qualities and component installations not typically found in a traditional stick built home.
Wiring will typically be as a sub panel
Typically no accessible attic
Typically no gutters installed
Typically numerous water intrusion issues from windows and doors to bathrooms and kitchen sinks
Typically belly wrap/vapor barrier is deteriorated and compromised
Older units quite often have PB2110 supply lines
Cabinets and other furnishings are typically cheap and inferior materials.
If skylights installed - pay close attention to these areas for water intrusion
The list goes on...
An excellent resource is: http://www.inspect-ny.com/structure/mobileinspections.htm
Congrats on your first and good luck Mike!