Lesserxlesser, butterxbutter, and lesserxbutter have a chance for bug eyes, which is why most people breed the safe combo of mojoxlesser or mojoxbutter. The bug eyes are cosmetic and the snakes can thrive regardless. They just look a little disturbing. (Search 'worst bug eyes I have ever seen')
Duckbilling in super cinnies/super black pastels are also cosmetic.
The links Mike posted are good sources. There are loads of morph related issues.
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