Got a beach house I could sell you in Idaho,
Frank definitely does not have a beach house in Idaho, considering there are no beaches in Idaho.
If you wanna get technical, Idaho does have beaches on lakes, and there are houses on those beaches, but those are usually referred to as LAKE houses. Beach house generally implies oceanfront property.
The line is one of the many blatant lies Ocean is telling to this person in this verse; not to mention a lie that will show whether or not someone is gullible. If they’re stupid enough to not realize that he loves them, he/she is stupid enough to buy a beach house where there clearly are no beaches.
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