During the Paris Safari Zone I also noticed the following things:
Don't stop walking! The malls are so small and you will encounter the same spawns throughout the mall.
So don't be anxious to miss something. You will get plenty of candy anyway.
Concentrate on the really rare spawns: Chansey, Larvitar
Only use pinaps on Mareep if you still need the pokedex entry.
Don't waste time on Magicarp and Pikachu (unless you still need the medal). A shiny check is enough.
It's a myth that the chance to catch a shiny increases the more you catch.
I had people walking with me with <500 Magicarp who caught 3 shiny Magicarp during the event only by checking.