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Isn't it caused by the friction between the clothes in the washing machine, and the friction between the clothes and the inside of the drum? Loose fibres and all that. This would also explain why it is more noticable in fabrics such as wool and acrylic.You could always try shaving the bubbles away.
@ paul. Shave them off, sorry no shaving equipment as I am a bearded one (der)! I must admit I have seen someone using sticky tape to remove them.