In the next picture below the inclusions are still "possible feathers" but with a higher probability of being bird feathers because 1) They visually appear more like feathers than the example given in the above picture. 2) This piece of amber also contains bird eggs and full birds.
The following picture is a feathered duck billed creature, CT scans show that these creatures had teeth and tiny feathers looking almost like scales until zoomed in on and full results will be uploaded here (OSS Open Source Science).