Well this is the time of year that landlords are examining the damage to the fittings and fixtures etc.
Off the top of my head for one place the doors of the brand new fridges have been kicked and dented, hole has been punched in a plaster wall, bed frame smashed, door lock ripped out by someone who lost their key. New chairs literally lying in the front garden with broken legs.
That's just the few things I'm aware of before a proper check. With reasonable proof a landlord is within rights to chase for some degree of compensation for damage.
Where there is no proof then it's somewhat dubious but that would be why it's a good idea for a landlord to photo or video the place before people move in.