At the beginning of the motorcycle chasing sequence through Los Banos, Quino wears canvas shoes. Some scenes later, when sliding on his motorcycle under the trailer, he's wearing leather boots.
When negotiating for the price of the necklace, he quotes and uses dollars. In Philippines, the correct currency is pesos.
From Manila to Los Banos, Laguna, one must ride a bus for public transport. Here, Anthony rides a jeepney, with the signboard San Pablo-Los Banos. It means he rode a jeepney from San Pablo, which is also part of Laguna, and not in Metro Manila. If you are coming from Manila, you reach Laguna first, then San Pablo.