1. in some videos with VPN you do not touch NAT statement (as far as I remember), in some of them you showed and excluded the required range...
You did not have NAT enabled on these routers? I think it was in 'ccna security' where you showed cli and in this video u proved a vpn tunnel coming up without changing any NAT?
2. In one ADSL video you showed a default static route like this: 0.0.0.0 0.0.0.0 Dialer1
I read, that it is not recommended and we should use:
ppp ipcp route default
Could u explain a little more :)