Hope this will help to find some stuff after modding! May add on to the guide when I come across more. Contains spoilers.
Stardew Valley Expanded
Glacierfish
In the Cindersap Forest. South of Fairhaven Farm, which is southwest of Marnie’s Ranch.

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Skull Cavern
In vanilla, the entrance is northwest of the Desert Trader in the Calico Desert. In SVE, it’s to the south. Head south while hugging the rocky area south of the Desert Trader. You should pass by the cat statue. The cavern entrance is to the statue’s southeast. Continue hugging the rocky area while heading south from the statue and turn east where it ends.


Bonefish & Undeadfish
The oasis wherein Bonefish and Undeadfish, SVE-original fishes, is the largest pool of water in the southeast of the Crimson Badlands map.

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Secret
Secret Note #20
The secret notes segment are from vanilla SDV but in Expanded, the map and some notes are altered. Obtained Secret Notes can be reviewed through Journal > Collections tab > Secret Notes.
The note in vanilla is a directional puzzle like #19 which brings the player to the truck. The puzzle is skipped in SVE.


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Secret
??HMTGF??
In vanilla, the crate is hidden in an enclosure of trees north of Clint’s blacksmith. In SVE, the crate is located slightly northeast of the community center.

Interact with it while holding a Super Cucumber (which will be lost).

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Secret
??Pinky Lemon??
Go to the northeastern room of the Stardrop Saloon (turn right at the counter, then turn north before entering the arcade area). In vanilla, there is a purplish box behind a barrel. In SVE, it’s the cardboard box next to the fridge. Interact with it while holding a Duck Mayonnaise (which will be lost).

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Secret
Pyramid Decal
In vanilla, the decal is fished by standing at a southern cliff at the Calico Desert. In SVE it can be fished from the water body between the Oasis shop where Sandy works and a cliff.

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Ridgeside Village
Quest
An Old Friend
I misplaced my old sword! The last thing I remember is that I was strolling by the waterfalls, but I don’t remember which one. I hope no one gets hurt when they find it, it’s quite sharp.
-Freddie
The sword isn’t by the waterfall near Freddie’s house, but by the one between the Nightingale Orchard and the Lidens Residence, partially hidden by a tree.

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Quest
Yuuma’s Lost Ring
Can I ask for help? I lost my ring… A ring my Mommy gave me a long time ago. I’ll pay you! I promise! I just can’t leave Shiro alone while I go search for it… Please find it!
– Yuuma
“Find Yuuma’s ring and bring it back to him. He remembers still having the ring when he was buying stuff from Jeric’s farm.”
Behind the plant box to the left of Jeric’s shop.

Awesome guide! Modding really adds new layers to Stardew Valley, and these location tips are super helpful. For those who enjoy the classic experience on mobile
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