Truss gusset plate not secured.  Structural problem that should be repaired ASAP.

Gasket around vent stack cracked and will allow water to enter attic.

Torn and missing shingle, hole in roof decking. This will lead to water infiltration into attic.

Foundation crack extending up into framing. Recommend further evaluation by a structural engineer.

Dirty air filter- reduces efficiency and makes unit work harder

Double tap into breaker- unsafe practice

Dryer venting into attic- Should be vented to the outside to reduce moisture in attic

Disconnected duct in attic.  It's not a good idea to condition your attic

Exposed nail heads should be sealed to prevent rust and possible water penetration