Spot the Difference answers

Tractor image - 

Light

House

Tyre tread

Smoke

Reflection on tractor mud guard

 

Horse image -

Eyelash

Number 1 in rosette

Tongue

Cross bar of fence

"Lolli pop" fence post

 

Zoo birthday party -

Umbrella

Zoo keeper's eye

Spot on hat

Back of chair

Ball

 

Drumming soldiers image -

Drumstick

Drum

Hat

Stripey Jumper

Trim on front of tunic

 

Monkeying around! image -

Tree branch

Grass

Umbrella

Shoe laces

Monkey's 'boobs'

 

Building block image -

Handle of box

Letter 'u'

Teddy's nose

Letter 'h'

Mouse