3) If their handyman can't handle a repair issue and they have to hire outside contractors, many PMC's will then charge a markup for their time - but they don't tell you this upfront or disclose in their management contract.

(For example, when I confirm a booking, I repeat all the disclosed guests and dogs or put in "zero dogs" and request any changes to those details be made in writing in advance so everyone is clear.)

What you were able to do- makes a good case for not disclosing all the amenities one provides- publicly.

It is fine as long as you disclose in the listings that there will be other guests on the property.  

The guru your son is learning this technique from is likely not telling your son that the deal will almost certainly encourage your son to get an "off-market" deal from a "wholesaler" who is unlikely to properly disclose the details of the property or encourage an inspection. 

Because now, legally, they have to disclose that if this all falls out.

I try and disclose problems.  

Unfortunately, it's now going to get more complicated:(There are two types of approaches PMCs use to bill for maintenance:1) In-house ServiceTechs on the payroll, so owners are billed for their time by the hour.While the labor charges above are useful, they don't cover the true costs a PMC incurs, like:- Payroll costs for FICA, Social Security, Medicare, etc. that typically add 25-40% to the hourly rate- Medical insurance costs for the worker- Payroll processing costs to handle all of the above- Liability insurance costs in case worker damages something or injures someone- Workman's Compensation insurance- Costs of vehicles and tools- and more...Typically the management contract will disclose the total hourly rate an owner will be charged.

Also, to disclose to the tenants I am a realtor, do I just put that after my name on the lease?

My two cents is that the non-live broadcast is a commonly used marketing tool If it was "live" when it was first broadcast, then it is not a "scam" in my opinion but a rebroadcast that does not disclose that fact (not as professional as it could be).