Downtown LA: Bike, pigeon, cash register cat (if bought)
Beverly Hills: Hydrant, coffee sign, tree outside Kim's Mansion. In panino: Leftmost bottle
Hollywood: leftmost tree, Brew Palms sign, Hydrant. In Brew palms: leftmost bottle again.
Calabasas: hanging plants (both) flower pot outside Kardash. In Kardash: mannequin in white outfit.
LAX: Suitcase, cash register, pigeon. In airport: Suitcase

Another hint: When energy/cash/level up points come out, click them straight away to decrease wait time for energy by 5 seconds. Happy collecting.