another questionable play by me

didn't anticipate the big blind having what he had. nice check by him on the turn. should i have assumed a jack high flush wasn't good anyway? this was a questionable play but i don't think it was that bad.

PokerStars Game #4501337403: Hold'em No Limit ($0.25/$0.50) - 2006/04/02 - 20:25:36 (ET)
Table 'Eugenia IV' 6-max Seat #4 is the button
Seat 1: creed616 ($15 in chips)
Seat 2: sasifricious ($27.95 in chips)
Seat 3: DeweyG ($62.65 in chips)
Seat 4: died eye ($32.25 in chips)
Seat 5: johnnyBuz ($30.35 in chips)
Seat 6: smellycat04 ($32.15 in chips)
johnnyBuz: posts small blind $0.25
smellycat04: posts big blind $0.50
*** HOLE CARDS ***
Dealt to johnnyBuz [Js 9s]
creed616: folds
sasifricious: calls $0.50
DeweyG: folds
died eye: folds
johnnyBuz: calls $0.25
smellycat04: checks
*** FLOP *** [4s 8d Tc]
johnnyBuz: bets $1
smellycat04: calls $1
sasifricious: folds
*** TURN *** [4s 8d Tc] [8s]
johnnyBuz: checks
smellycat04: checks
*** RIVER *** [4s 8d Tc 8s] [3s]
johnnyBuz: bets $3.35
smellycat04: raises $11.65 to $15
johnnyBuz: calls $11.65
*** SHOW DOWN ***
smellycat04: shows [8c 4d] (a full house, Eights full of Fours)
johnnyBuz: mucks hand
smellycat04 collected $31.85 from pot
*** SUMMARY ***
Total pot $33.50 | Rake $1.65
Board [4s 8d Tc 8s 3s]
Seat 1: creed616 folded before Flop (didn't bet)
Seat 2: sasifricious folded on the Flop
Seat 3: DeweyG folded before Flop (didn't bet)
Seat 4: died eye (button) folded before Flop (didn't bet)
Seat 5: johnnyBuz (small blind) mucked [Js 9s]
Seat 6: smellycat04 (big blind) showed [8c 4d] and won ($31.85) with a full house, Eights full of Fours