Ok for those who keep having trouble with finding the crowbar it is glowing a goldesh color that’s kind of hard to miss. Just look around you will find the crowbar. Once you find it make sure to use the space bar to grab it. Don't forget to use the W, A, S, D keyboard keys for zooming in and out and rotating the camera around.

Getting inside the store is not really that hard. The crowbar basically acts like a key. Use the crowbar on the wood to get inside the store.

The Octobill is one of the items you need to find. For those who can’t figure it out it’s a small flat cash bill with Octodads face on it.
Warning Spoiler The Octobill can be found in the fruit section of the store. You will find it on the back right side under the wood crate.

This one can be a little tough but the Gold #1 dad mug that you must find is in a secret place. Just bash and hit everything till you find it including maybe a wall or two. You may have to move some stuff out of the way to find it.
Warning Spoiler The Gold #1 dad mug is behind a hidden wall. Once you enter the store just keep going straight down the center path till you come to the wall at the end. Once at the wall just hit it or grab the wall with Octodads tentacles to move it out of the way. From there you will find the gold mug under the crates.