Are there typical behaviors of dementia?

There are many. Dementia can be thought of as a cognitive disorder or as a behavioral illness. Nearly everyone with dementia will have behavior problems at some time. Psychomotor agitation, anxiety, sleep disturbances, appetite disturbances, depression, paranoia/delusions, hallucinations, aggression, mood lability, and apathy are some of the most common symptoms. Most of these symptoms are treatable.
Yes there are. The most common typical early signs of dementa are increasing memory loss, personality chages like irritability or fearfullness, missing appts and medications, getting lost in familiar locations, misnaming objects and people.