cercare il pelo nell'uovo significa in inglese

nitpick [nitpicked, nitpicking, nitpicks]▼(to correct minutiae or find fault)
verb
[UK: ˈnɪt.ˌpɪk] [US: ˈnɪt.ˌpɪk]

split hairs▼(to consider fine details)
verb
[UK: splɪt heəz] [US: ˈsplɪt ˈherz]